Sunday, May 16, 2010

Botany 120 Biome and genetics review


1. How is a phenotype different from a genotype?

2. How is the law of segregation different from the law
of independent assortment?

3. What is an allele?

4. If a pair of alleles are the same we call this
genotype _____,and if the alleles are different
the genotype is called _____.

5. In four o'clock flowers, the petal color is either red,
pink, or white. How do you think flower color
is inherited and why?

6. A gene that is only expressed if it is in the homozygous
condition must be a ______ gene.

7. In a certain species of flower there are two petal colors,
blue or red.If two blue flowered plants are crossed,
the offspring are always blue.If two red plants are crossed,
sometimes only red flowering plants are produced, while
other times both red and blue flowering plants are
produced. If a red plant and blue plant are crossed,
sometimes the offspring are all red, while other
times both red and blue offspring
are produced. Which color is dominant?

8. A plant that breeds true for tall is crossed with one that
breeds true for short. All of the offspring in the F-1 are tall.
The F-1 generation is allowed to self-fertilize, and the
F-2 are 3/4 tall and 1/4 short.
a. which allele is dominant, the one for tallness or shortness?
b. what is the genotype of an F-1 individual?
c. what are the genotypes of the parental generation?

9. In peas, purple flowers (P) are dominant to white flowers (p),
and yellow seeds are dominant (Y) to green(y). If two plants
heterozygous for both traits are crossed, what proportion
of the offspring will have purple flowers and
produce green seeds?

10. Which of the following are homozygous
a. AABb
b. aabb
c. AaBb
d. aaBB
e. Aabb

1. What are two important factors in determining what
type of Biome one will find in a given area?

2. What causes the seasons here in North America?

3. What are three strategies plants have developed to survive
in the cold dry,and sometimes dark conditions of the Tundra?

4. What is a rain shadow, and how does it account for different
plant communities occurring at the same latitude, but on
opposites sides of a mountain range?

5. In what biomes does fire play an important role, and
what is this role?

6. To what kind of environmental stresses are the plants
in the chaparral adapted?

7. How is a deciduous forest different from a coniferous
forest, other than the types of trees found in each?

8. Why don't grasslands become forests?

9. What is the one thing all deserts have in common?

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